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EPA method 1311
and water effluents
This grade has medium flow rate and good particle retention and is most commonly used for applications requiring high chemical resistance to strong acid and alkali
48 mm - 240 mm / 30 min
Low-Ash Hardened Paper - 3910-0900 - Grade 391, 9cm 74 EPA method 1311Ahlstrom Munksj 391 2 3 m, Slow Speed This is a very fine retention filter for gravimetric analysis of very fine particles such as barium and lead sulfates, stannic and nickel sulfide, calcium oxalate and calcium fluoride.
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